Definitions by Super Dave's Sidekick

Poop-gasm 

The feeling of pure relief and the audible sigh a person makes when releasing a bowel movement that has been held in much too long.

After being stuck in a meeting for two hours Jack ran to the bathroom and had a poop-gasm in stall #2.

Poop-gasm by Super Dave's Sidekick October 28, 2011